package com.save.until;

import java.io.File;
import java.io.FileOutputStream;    
import java.io.InputStream;  
import java.io.InputStreamReader;
import java.io.OutputStream;    
import java.net.URI;  
import java.util.Enumeration;    
import java.util.HashMap;    
import java.util.Map;    
import java.util.Properties;    
/**
 * 读取文件工具类
 * @author zhangzhuo
 *
 */
public class PropertiesUtil {    
    
    private Properties props;    
    private URI uri;  
    private static PropertiesUtil ourInstance = new PropertiesUtil("/config.properties");
    public static PropertiesUtil getInstance() {
        return ourInstance;
    }
    public PropertiesUtil(String fileName){    
        readProperties(fileName);    
    }    
    private void readProperties(String fileName) {    
        try {    
            props = new Properties();    
            InputStream fis =getClass().getResourceAsStream(fileName);   
            InputStreamReader re=new InputStreamReader(fis,"utf-8");
            props.load(re);    
        } catch (Exception e) {    
            e.printStackTrace();    
        }    
    }    
    /**  
     * 获取某个属性  
     */    
    public String getProperty(String key){    
        return props.getProperty(key);    
    }    
    /**  
     * 获取所有属性，返回一个map,不常用  
     * 可以试试props.putAll(t)  
     */    
    public Map getAllProperty(){    
        Map map=new HashMap();    
        Enumeration enu = props.propertyNames();   
        while (enu.hasMoreElements()) {    
            String key = (String) enu.nextElement();    
            String value = props.getProperty(key);    
            map.put(key, value);    
        }    
        return map;    
    }    
    /**  
     * 在控制台上打印出所有属性，调试时用。  
     */    
    public void printProperties(){    
        props.list(System.out);    
    }    
    /**  
     * 写入properties信息  
     */    
    public void writeProperties(String key, String value) {    
        try {    
        OutputStream fos = new FileOutputStream(new File(uri));    
            props.setProperty(key, value);    
            // 将此 Properties 表中的属性列表（键和元素对）写入输出流    
            props.store(fos, "『comments』Update key：" + key);    
        } catch (Exception e) {    
        e.printStackTrace();  
        }    
    }       
  
}
